Integrated intensity of the SiO(2−1) transition against the shock velocity calculated over the nH = 104 cm-3 fragment of our grid of models (colored symbols), and compared to the observations (thick, horizontal black line, obtained in position 1, with thinner lines corresponding to ± 15% uncertainty; see Tables 7 and 8). The left and right panels correspond to the SiG (square symbols) and SiM (circle symbols) scenarios (see text). The color code is indicated in the panels, where the G0 (=0 or 1) value and fraction of preshock free silicon (=1 or 10%) is shown for each model.
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